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Two parameters of the fitted psychometric function are plotted with circles as a function of child observer age, with the filled circle indicating the slope estimate of the outlier child observer C4. The threshold value for C4 is not shown because it is greater than the 8 dB axis limit. Adult values are plotted with stars at an arbitrary point on the abscissa. The top panel indicates thresholds for 71% correct in units of ΔL, and the bottom panel shows results for function slope (k).
